It's technically the dereference of a symbolic reference that's not allowed. However, there is a (documented) exception: 

\&$sub_name

[download]

This means that while 

$sub_name->()

[download]

isn't allowed, 

(\&$sub_name)->()

[download]

is allowed.

($invocant->$method_name() is also allowed under strict.)

In reply to Re^2: Function name in a variable, can't recall the concept by ikegami
in thread Function name in a variable, can't recall the concept by mpersico

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